A cobpobation of new jeesey



March '22, 1932. s. B. REDFIELD 1,350,590

RETAINING DEVICE FOR PLATE VALVES Filed Dec. 1, 192a .P Ill 1/" lfllz III/l V a HISA TTORNEY.

Patented Mar. 22, 1932 I 1 sur oEFIcEi:

SAIQWPBN B- E SEQN PENN YLVAN e s v n mo me nsomraann conreivxor'annsny GITY,NEW1JERSEY A oomaonarron or NEW .nmsnr" RETAINING DEVICE. non r ArE VALVES Application filed December 1, 1 92s.- Serial No. 323,077.

This invention relatesto compressors, but more particularly to a retaining device adaptedtdsecure the plate valves in the .com-

pressor, I One object of the inventionjis to facilitate the operation of installing a plate valve, its retainingmeans and the valve controlling means, such as a valve lifter, in the compressor, head as aunit-Q Other objects will be in part obvious and in partpointed out hereinafter.

The accompanying drawing I. illustrating the invention is a vertical sectional elevation of a compressor headand a plate valve illustralting ,a' 'practical application, of the invent'ion. f" 1 Referring more. particularly. to the drawing,.A represents a portion of a compressor hea'dliaving an:.inner wall B and an outer wall G suitablyfspaced with respect .to each other. to form a'p'assage D through which the element intended tobe compressed may flow-to thercylinder inlet, such as a valve opening in the (inner wall By The valve opening Eis adapted to accommodate a plate valve E which may, as illustrated, bean inlet valve comprising a valve seatG, a valve plateH anda stop-plate J. The inlet valve may be of any well known type and its component parts may be held together in any suitablemanner as for instance byia bolt K which extends through the valve seat G, the valveplateiH and'the stop plate J. and is provided with anut L whereby the parts comprising the together.

Formed in the outer wall a is acover opening 'O toreceive an extension P of a cover Q, which forms a closure for the cover opening 0. The cover Q is preferably secured to the compressor head A by means of bolts R which extend through a flange S of the cover Q, and are threaded into the outer wall C of the head.

A difiiculty frequently encountered in installing plate valves and their adjuncts in compressor heads is that of maintaining these elements in coaxial. relationship duringthe process of installation, particularly where the valve openings'lie in inclinedp'ositions. This platevalve are clamped securely Q of the head A- the installation in the compressor head, i

order therefore to facilitate the operation of installingthe device in the compressor, a hollow body T having an outer wall U and an inner concentric wall V is disposed on the valve seat G and carries at its front end an annular-flange W which encircles and engages the adjacent end of thevalve seat G. On the innersurface of the outer wall U are lugs X having apertures Y to'accommodate bolts Z' which maybe'threaded into the valveseat G for securing thebody T to the valve seat. Inasmuch as the distance between the inner and outer walls of the compressor head, and therefore-the distance between the openings -E and 0, may vary'andin view' of the fact -U. The recess 1) serves as a seat for an inner cover (Z which is secured to the body T by" means of. screws 6 and extends slidably with its free end into a bore f, inthe extension P of. the cover Q; Theinner cover- (5 in this in: stance has a central hub 9 against which pressure maybe applied by a set screw 72, threaded,

into the outer cover Q, for pressingthe valve seati G firmlyin position in the inner wall B. At times it may be advantageous to employ 1 free, ,air unloading means for unloading the. compressor when the pressure in the receiver into which the compressed'fluid is deliveredreaches acertain predetermined-value; The; present invention lends itself readilyto this type of unloading device, and for illustrative lee purposes an unloading device is shown in the form of a plunger 7' guided slidably by the wall V. The plunger 9' carries at its inner ends fingers is which extend through the valve seat G to a point near the valve plate H against which they are adapted to press for unseating the valve plate. The plunger j may be provided with a recess 0 to receive a spring 12 which bears with one end against the valve seat G and withits other end against the roof of the recess 0 :fornorm'ally holding the fingers is free from the valve plate In order to actuate the plunger through the medium of pressure fluid, a diaphagm 1] is clamped at its edge between the inner cover d and the body T and bears with its intermediate portion against the endof the plunger, 1.

The inner cover cl m'ay'be slightly concave at the portion overlying the end of the plunger to form a pressure Chamber 9 into which pressure fluid may be introduced for actuating the plunger j and consequently the fingers k to unseat the valve plate H. In the present instance such pressure fluid is introduced into the space between the inner cover and the diphragm through a threaded passage sin the hub g which registers with a passage t in the set screw 71, and the passage t in'turn is in communication with a suitable supply connection it threaded into the end of the set screw.

In order to assure against leakage between the end of the set screw and the hub g, a tapered or ball seat a may be formed on the end of the hub g to accommodate a correspondingly shaped end to of the set screw which cooperates with the seat 1) to form a fluid tight joint around the adjacent openings of the passages s and t.

During the operation of installing the valve mechanism in the compressor head A, the

' plunger 7' with the spring 79 may first be disposed in the body T, and the said body T may be secured to the valve seat G by means 01 the screws Z. In this way the body T and the valve seat will be secured firmly together. After these parts have been thus assembled, the diaphragm Q and the inner cover (I may be placed in position in the recess b and secured to. the body T by means of the screws 6. Thereafter the cover Q may be disposed on the inner cover (1 and a bolt of any suitable length may be extended through the cover Q and threaded into the passage 8 to secure thecover Q'to the inner cover (I.

When assembled in the manner described, the valve and the associated elements will be in their proper relative positions and may .therefore readily be installed in the compressor head. After the valve and the connected parts have been installed in the compressor head and the bolts R are threaded into the outer wall C to secure the cover Q, in position, the bolt previously used for connecting readily seen that the joints between the valve seat and the inner wall and those between the outer cover and theouterwallma'y'be effectively sealed against leakage and that .either one of these joints may be tightened separatelywithout disturbing the other joint or joints.

1. In a compressor, the combination of'fa. compressor heada-nd aaplate valve, said head having an inner wall with a valve opening and -an=outer wall with a cover opening coa xial with the valve opening, a plate valve in the valve opening, a cover forming a closure for the cover opening and having a bore, a body interposed between the plate valve and the cover and in engagement with the plate valve, an inner cover secured to the body and lying wholly within the bore for holding the plate valve coaxial with the cover, and aplurality of bolts engagin the body and threaded into the plate valve or securing said body to the plate valve, thereby enabling the plate valve and the cover to be disposed in the compressor head as a unit. I

Q. In a compressor, the combination of a compressor head and a plate valve, said head having an inner wall with'avalve opening and an outer wall with a cover opening coaxial with the valve opening, a cover forming a closure for the cover opening and having a bore, a body having an outer wall in engagement with the plate valve and an integral inner guide, a valve lifter disposed slidably in the guide, an inner cover lying wholly within the bore and being seated on the outer wall of said body for holding the body and the plate valve in coaxial alignment with the SNOWVDEN B. REDFIELD. 

